Fixed issue: Security problems with uploaded files in administration
Fixed issue #7648: Blank screen after user registers for a survey
Fixed issue #7652: User groups permissions shows Access denied
Fixed issue #7654: Better handling of numbers in Excel export - patch by slansky
Fixed issue #7193: A shared user can definitively delete a shared participant
Fixed issue #7643: Answer code is not set in comment field headings when exporting responses
Fixed issue #7195: Impossible to add participants from survey to CPDB
Fixed issue #06509: Central Participant Database: Attributes mapping is difficult with high number of attributes (UI)
Dev: Forced min-height of sortable lists to parent's height